Because of the singleness of the rotation factor

fractional Fourier transform (FRFT) is rarely used in real-time video encryption. While at present

the simple chaotic encryption algorithms have many security problems. Consequently

a new real-time video encryption algorithm-chaotic key modulating discrete fractional Fourier transform (DFRFT) rotation factor is proposed. This algorithm combines chaotic encryption with DFRFT. First

we modulate the DFRFT rotation factor by a chaotic key. Second

we use the modulated rotation factor to carry on fractional Fourier transform

so as to complete the encryption operation for video data. The encryption system realizes real-time acquisition

real-time encryption and transmission

as well as real-time reception

real-time decryption and playing at the receiving terminal. The experimental results show that the system has a good effect in the encryption and decryption and can meet our real-time and security requirements. The theoretical analysis on the experiment results indicate that this algorithm is simple and practicable

with a high-level of security. The security of the algorithm is better than simple chaotic encryption algorithm or the simple FRFT encryption algorithm. We can draw a conclusion from results that this algorithm provides a novel mechanism for resolving the dispute between real-time and security.